Laboratoire des science des Materiaux et dEnvironnement

Sfax, Tunisia

Laboratoire des science des Materiaux et dEnvironnement

Sfax, Tunisia

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Koubaa M.,Laboratoire des science des Materiaux et dEnvironnement | Karray R.,Laboratoire des science des Materiaux et dEnvironnement | Dhifallah N.,University of Sfax | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement | Bsais L.,University Paris Est Creteil
Journal of Alloys and Compounds | Year: 2017

The powder sample of xMnO2–(1−x) ZrTe3O8 (x = 7%) was prepared by the conventional solid state reaction method. X-ray diffraction showed that the compound crystallized at room temperature in the cubic fluorite structure (in a cubic unit-cell Ia3¯ as MTe3O8-type framework) with lattice parameter a = 11.3298(2) Ǻ. The structure was built up of TeO4E (E = Electronic lone pair of Te(IV)) disphnoids and regular ZrO6 octahedra. The crystal structure cohesion was ensured via Te[sbnd]O(2)[sbnd]Zr and Te[sbnd]O(1)[sbnd]Te bridges. The Raman spectrum was dominated by a stronger band at 858 cm−1, characteristic of Te[sbnd]O(2)[sbnd]Zr bridges asymmetric stretching vibration. Thus, the Te[sbnd]O(2) and Zr(Mn)[sbnd]O(2) bonds are chemically inequivalent and then the Te[sbnd]O(2)[sbnd]Zr bridges are chemically asymmetric. Magnetization measurements versus temperature in an applied magnetic field of 0.05 T were determined. The doping of Zr by Mn induces a ferro-paramagnetic transition at T = 18.5 K. The complex impedance of the xMnO2-(1−x) ZrTe3O8 (x = 7%) ceramics has been investigated in the temperature range 293–843 K and in the frequency range 100 Hz–1 MHz. Dielectric data were analyzed using complex permittivity (ε′), (ε″) and tan (δ) for the sample at various temperatures. The conductivity follows the Arrhenius relation. © 2017 Elsevier B.V.


Hentech I.,Laboratoire des science des Materiaux et dEnvironnement | Hentech I.,University Paris Est Creteil | Zehani K.,University Paris Est Creteil | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement | And 3 more authors.
Journal of Molecular Structure | Year: 2016

Two new iso-structural bimetallic hydrogenselenites [Cu2-xNix(HSeO3)2Cl2.4H2O] (x = 0.62; 0.91) have been synthesized from solution and characterized by single-crystal and powder X-ray diffraction. They crystallized in the orthorhombic Pnma space group with the following lattice parameters: for Cu1.09Ni0.91(HSeO3)2Cl2.4H2O: a = 9.0931 (2) Å, b = 17.7717 (4) Å, c = 7.1620 (2) Å, Z = 4, and for Cu1.38Ni0.62(HSeO3)2Cl2.4H2O: a = 9.0931 (4) Å, b = 17.7467 (7) Å, c = 7.1717 (3) Å; Z = 4. The crystal structure of this compound consists by a three-dimensional framework, but it may be described as a bi-dimensional structure consisting of layers, parallel to the (010) plane formed by two types of (Cu/Ni) octahedral and (HSeO3)- trigonal pyramids. The magnetic measurement, thermal and spectroscopic studies were performed for these compounds. The magnetic results reveal the appearance of a weak ferromagnetic behavior at low temperature (Tc = 16 K for x = 0.91 and 18.8 K for x = 0.62). The DSC analysis enabled us to locate two endothermic peaks. The first peak can be attributed to a completely dehydration of the material, in this transformation, the compounds undergo a structural phase transition which can favor a non-centrosymmetric phase at high temperature confirmed by the thermodiffractograms measurement. The second peak for these samples is due to the ferro-paraelectric phase transition which can be explained by an order- disorder transition. © 2016 Published by Elsevier B.V.


Ghribi N.,Laboratoire des science des Materiaux et dEnvironnement | Karray R.,Laboratoire des science des Materiaux et dEnvironnement | Laval J.P.,Laboratoire Des Procedes Ceramiques Et Of Traitements Of Surface | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement | Ben Salah A.,Laboratoire des science des Materiaux et dEnvironnement
Journal of Materials and Environmental Science | Year: 2015

A novel mixed tellurium oxide, Ce0.07Ti0.93Te3O8, has been synthesized and its crystal structure was determined from X-ray powder diffraction data. Rietveld refinement led to final confidence factors Rp=10.3% and Rwp=15.3%. This oxide, which crystallizes in a cubic unit-cell I a 3 as MTe3O8-type framework with cell parameter a=10.985(9) Å, exhibits a structure built up of TeO4E (E= Electronic lone pair of Te(IV) disphnoids and regular Ce/TiO6 octahedra. The crystal structure cohesion is ensured via Te-O(1)-Ce/Ti and Te-O(2)-Te bridges. The Raman spectrum is dominated by a strong band near 470 cm-1 and a weaker one near 650 cm-1 leading to a chemically symmetric Te-O(1)-Ce/Ti bridges.


Karray R.,Laboratoire des science des Materiaux et dEnvironnement | van der Lee A.,Montpellier University | Jarraya S.,Ecole preparatoire de lacademie militaire | Ben Salah A.,Laboratoire des science des Materiaux et dEnvironnement | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement
Arabian Journal of Chemistry | Year: 2014

The crystal structure of lithium-ammonium hexabromotellurate [(NH4)0.63Li0.37]2TeBr6, has been determined by X-ray single crystal analysis at room temperature. The space group is Fm3-m, with a=10.7200(12)Å. Differential scanning calorimetry reveals three anomalies at 195, 395 and 498K. Below 195K the phase transition leads to a tetragonally distorted structure. This low temperature phase shows an anti-ferrorotative displacement of TeBr62- octahedra with a tilt angle 6°. The title compound has an anti-fluorite-type arrangement of NH4+/Li+ and octahedral TeBr62- anions. © 2010.


Baklouti Y.,Laboratoire Des Science Des Materiaux Et Denvironnement | Issaoui F.,Route de Soukra km 3.5 | Bekri M.,King Abdulaziz University | Dhahri E.,Route de Soukra km 3.5 | Zouari F.,Laboratoire Des Science Des Materiaux Et Denvironnement
Journal of Superconductivity and Novel Magnetism | Year: 2015

Synthesis, crystal structure, vibrational study and magnetic properties of the compound (C7H18N2) CuCl4 are reported. The latter crystallizes in the monoclinic system (space group P21, Z = 4) with the following unit cell dimensions: a = 7.569(5) Å b = 14.174(5) Å, c = 13.193(2) Å and β = 105.53(3)∘. Besides, its structure was solved using 5754 independent reflections down to R = 0.0475. The atomic arrangement can be described by alternating organic and inorganic layers stacked in the [1̄01] direction, made up of tetrahedral of tetrachlorocuprate CuCl2− 2 sandwiched between two organic layers. In crystal structure, the inorganic layer, built up by independent monomeric [CuCl4]2−, is connected to the organic ones through hydrogen bonding in order to build a three-dimensional network. The magnetic behavior of (C7H18N2) CuCl4 samples was investigated as a function of temperature and applied field. At hightemperature paramagnetic behavior, and at low temperature, evidence for weak ferromagnetism, reinforced by a hysteresis loop at 2 K is observed. The magnetic behavior of (C7H18N2) CuCl4 is attributed to Cu (II) due to the presence of an active Jahn–Teller effect in the d9 electronic system, which give rise to short-range weak ferromagnetism. © 2015, Springer Science+Business Media New York.


Belgaroui H.,Laboratoire des science des Materiaux et dEnvironnement | Loukil M.,Laboratoire des science des Materiaux et dEnvironnement | Karray R.,Laboratoire des science des Materiaux et dEnvironnement | Salah A.B.,Laboratoire des science des Materiaux et dEnvironnement | Kabadou A.,Laboratoire des science des Materiaux et dEnvironnement
Journal of Structural Chemistry | Year: 2010

The crystal structure of rubidium-ammonium hexachlorotellurate [Rb0.94(NH4)0.06]2TeCl6 was determined by X-ray single crystal analysis at room temperature. The space group is Fm3̄m with the lattice parameter a = 10.2503(5) Å and Z = 4. The refinement converged to R(F) = 0.015 and wR(F2) = 0.032. As in the studied [Rb0.94(NH4)0.06]2TeCl6 family, this compound has an antifluorite-type arrangement. Tellurium atoms are surrounded by an octahedron of chlorine atoms. The Rb or N atoms are located between TeCl 6 2- octahedra ensuring the stabilization of the structure by ionic and hydrogen bonding contacts N-H...Cl. The substitution of rubidium by ammonium groups does not affect the structural arrangement, but it leads to a decrease in the a lattice cell dimension. IR and Raman spectroscopic studies at room temperature were performed to confirm the X-ray crystallographic results. © 2010 Pleiades Publishing, Ltd.

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